Question about 1979 Harley Davidson XLH 1000 Sportster

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Back brake locks up

I have rebuilt the front and back master cyclinder and all the calibers changed shoes and it is still locking up.
And where do u put gear oil in at

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  • crazycritter Jun 03, 2009

    yes I have blead the brakes but still hanging up on me

  • MrRepairAll May 11, 2010

    THe fluids should be under the seat. Brake fluid is a much different fluid than the gear oil.



    Do you have a brake fluid line that was "bled" after rebuilding the master cylinder?

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Rear brake lock-up can also be caused by the caliper carrying pins and the caliper pin holes. Check to make sure these are smooth and clean. The most likely problem though will be the rubber line coming from the splitter leading to the caliper. With age these get soft inside allowing fluid to pass one way easily but not the other. Remove this line and blow through it both ways to insure the fluid can pass both ways.

By gear oil I assume you need to add tranny oil. This is added on the left side of the bike by removing the front round plug on the primary cover and pouring it through the hole. With the plug removed you can also check the adjustment of your primary chain. If you need to add motor oil this is done on the right side and is found by removing the battery cover.

Posted on Jun 29, 2009

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Here is a link for the aftermarket service manual >>>
http://sunnymeadcycles.com/files/1966-84_Shovels_Aftermarket_Service.pdf

Posted on Jun 02, 2009

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The master cylinder is binding not allowing full return if you still have oressure on brakes. Hoses sometimes seperate and cause a flapper effect closing of t ge hose in one direction.. In this case, maybe in the return direction of flow. Reco,mmend changinging brake hose at rear brake. Good luck and be safe.

May 27, 2009 | 1979 Harley Davidson XLH 1000 Sportster

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